VMware vs Microsoft enterprise virtualization platforms comparison

Fujitsu-Siemens just released an interesting paper comparing VMware GSX and ESX Server, and Microsoft Virtual Server 2005 Enterprise Edition:

Today’s server systems are extremely efficient. Applications frequently only use a fraction of the servers’ resources. Server virtualization makes it possible to run several operating systems on one server at the same time so as to achieve a better server workload. Furthermore, virtualization enables a logical separation of the applications.
This document describes the three most important virtual server products VMware ESX Server, VMware GSX Server as well as the Microsoft Virtual Server 2005 and provides an overview of their performance.

The whitepaper seems just the first of a much more complete Sizing Guide.

Thanks to Anders for this jewel!